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From Jeremy Boynes <jboy...@apache.org>
Subject Re: Sharing code
Date Mon, 05 Sep 2005 20:28:07 GMT
Daniel John Debrunner wrote:
> Jeremy Boynes wrote:
>>David W. Van Couvering wrote:
>>>The common classes will be placed into both derby.jar and
>>>derbyclient.jar.  When you have a classpath with a network client at
>>>one revision and the embedded driver at another revision, the jar with
>>>the highest revision should always go first, e.g
>>>"/home/derby/10.2/derbyclient.jar:/home/derby/10.1/derby.jar".  This
>>>ensures that the newer code that depends on new interfaces (e.g. a new
>>>method for a class) will be able to function properly.
>>Others have pointed out the problems here with classpath ordering.
>>The root of this is that the same classes are being included in multiple
>>jars leading to potential duplication. This can be avoided by placing
>>them in a separate jar so that each is only present once e.g.
> Not true, the problem exists if the classes are in a single jar or
> multiple jars.

Only if you include two different versions of the same jar in the path, 
which you wouldn't.

Because there is no overlap between jars the user is able to clearly 
specify the version they want of every class by including the 
appropriate jar in the path irrespective of order.


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